Elementary Statistics: A Step-by-Step Approach with Formula Card 9th Edition

Published by McGraw-Hill Education
ISBN 10: 0078136334
ISBN 13: 978-0-07813-633-7

Chapter 2 - Frequency Distributions and Graphs - 2-1 Organizing Data - Exercise 2-1 - Page 51: 6

Answer

boundary is 124.5-131.5 midpoint is 128 width is 6

Work Step by Step

Since the class has 0 decimal places, the boundary will have 1 decimal place. Subtract 0.5 from smallest value and add 0.5 to the largest value to find the boundary. $125-0.5=124.5$ $131+0.5=131.5$ To find the midpoint, add the upper and lower values and divide by 2. $\frac{125+131}{2}=\frac{256}{2}=128$ To find the width, subtract the lower value from the upper value. $131-125=6$
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